Path: utzoo!mnetor!uunet!husc6!hao!gatech!mcnc!decvax!dartvax!stevel
From: stevel@dartvax.Dartmouth.EDU (Steve Ligett)
Newsgroups: comp.sys.mac
Subject: Re: RAM upgrade of Mac512KE.
Message-ID: <7833@dartvax.Dartmouth.EDU>
Date: 29 Dec 87 14:06:19 GMT
References: <3703@islenet.UUCP> <4936@spool.cs.wisc.edu>
Reply-To: steve.ligett@dartmouth.edu (Steve Ligett)
Organization: Dartmouth College, Hanover, NH
Lines: 27

In article <4936@spool.cs.wisc.edu> planting@colby.WISC.EDU ( W. Harry Plantinga) writes:
>>I'm studying various products I can use to enhance my Mac 512KE to 
>>2M RAM with a SCSI port.
>... I started
>with a 128k mac and upgraded to 512k myself with the dr dobbs upgrade.
>The memory chips are in sockets.  Will the MacSnap upgrades still
>work?

Maybe.  You'll have to take out two of the sockets - the ones next
to the resistor networks.  Also, you might have to redo your 74f253;
they often stick up too high, and many folks don't put pullups on the
address lines going to pins 5 and 6.  When you redo it, you can trim
its pins a little first, to make it lower.

I think we've got about 50 machines that were origninally 128k that
were upgraded with a Dr. Dobbs-like upgrade, and now have macSnap
upgrades on them.  Some of them are reliable; some ... well, opinions
vary.  Whether one would work for you depends on several things, such
as how much do you carry (bang) your machine around - the upgrade boards
tend to "walk" off the board below due to expansion and contraction, and
I believe that they "walk" more if jostled, and your luck.

Most of our upgrades are just the 1mb MacSnap, and most don't have the scsi
port.
-- 
   Steve Ligett     steve.ligett@dartmouth.edu or
(decvax harvard ihnp4 linus)!dartvax!steve.ligett